What does it mean if a girl kisses me on my forehead while I was asleep?

two other friends are in the room one of which she is "talking to" and I hardly know her, if your wondering how I knew she kissed me if I was asleep,my friend was messing with my face then she kissed me so I was awake but my eye were closed and and I was dozing back asleep,plus the next day she told me. she obviously wanted me to know she kissed me but y? what should I do?